According to: http://msdn.microsoft.com/en-us/library/windows/apps/system.io.streamreader.aspx
And: http://msdn.microsoft.com/en-us/library/windows/apps/f2ke0fzy.asp
"This is one of the fundamental changes in WinRT. You can't just write a file anywhere you want anymore, you have to use isolated storage. And you need to use asynchronous I/O with the await keyword."
This link should provide you with the necessary information on how to access files in your project folder. Here is the link:
http://blog.jerrynixon.com/2012/06/windows-8-how-to-read-files-in-winrt.html